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Effects of Laser Texturing on Technical Surfaces

Published online by Cambridge University Press:  11 February 2011

Y. Gerbig ,
G. Dumitru ,
V. Romano ,
V. Spassov  and
H. Haefke
Y. Gerbig
Affiliation:
CSEM Swiss Center for Electronics and Microtechnology Inc., Neuchâtel, Switzerland
G. Dumitru
Affiliation:
Institute of Applied Physics, University of Berne, Switzerland
V. Romano
Affiliation:
Institute of Applied Physics, University of Berne, Switzerland
V. Spassov
Affiliation:
CSEM Swiss Center for Electronics and Microtechnology Inc., Neuchâtel, Switzerland
H. Haefke
Affiliation:
CSEM Swiss Center for Electronics and Microtechnology Inc., Neuchâtel, Switzerland
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Abstract

Different laser beam techniques were applied to AISI M3 steel samples in order to produce well-defined surface microtextures consisting of pores, which can act as lubricant pockets (reservoir) as well as traps for wear debris. Both effects contribute to improve the tribological performance of textured functional surfaces. The tribological performance of lasertetxures was studied as function of the pore depth and diameter in unidirectional sliding tests under starved lubrication. The lasertetxured surfaces tested under those conditions were produced by a well-established ns laser technique using a Q switched Nd:YAG laser. The topographical microstructures of these laser-induced textures were characterized by optical and scanning electron microscopy as well as replica technique. A significant change in friction behavior as compared to untextured tool surfaces was observed when using microtextured surfaces.

In another part of the study, the influence of new-developed fs laser technique of the tool steel was investigated. The fs laser texturing of the steel results in a change of the metallographic structure of the laser-affected zone, which is clearly detectable in cross-section samples. The structure of the material and chemical composition of the laser-affected, pore-near region was analyzed by transmission electron microscopy with combined EDX analysis. It could be shown that the laser-affected zone seems to consist of an amorphous or nanocrystalline material in opposite to the ‘macrocrystalline’ steel substrate. Nanoindentations revealed a two times higher hardness of the laser-affected zone than the steel bulk phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 750: Symposium Y – Surface Engineering 2002–Synthesis, Characterization and Applications , 2002 , Y5.37
Copyright
Copyright © Materials Research Society 2003

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References

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